| 单词 | parallelogram protractor |
| 释义 | > as lemmasparallelogram protractor ΚΠ 1704 J. Harris Lexicon Technicum I Parallelogram Protractor, is a Semicircle of Brass, with four Rulers, in form of a Parallelogram, made to move to any Angle; one of which Rulers is an Index, which shews on the Semi-circle the Quantity of any inward or outward Angle. < as lemmas |
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